Cobalt 227 Page 5

VOLVO PENTA AQUAMATIC 350 (5.7L) GSi/DP DUOPROP
8-cylinder, 4-stroke 280 HP gasoline marine engine

Engine	Chevrolet 350 (5.7L) gasoline engine. Fresh water cooled with cast iron cylinder block, cylinder heads and sea water cooled exhaust manifolds, specially developed for marine environment. Easily accessible seawater pump located in the front of the engine.
Fuel injection	Electronic Fuel Injection (EFI) Throttle Body Injection (TBI) execution. The TBI system is monitored by an Electronic Control Module (ECM) and gives the following advantages: More responsive and smoother acceleration. Excellent turnkey starts in all weather conditions. Smooth, reliable idling. Reduced fuel consumption. Improved control of emissions. Additional features built into the system are: engine knock control for compensation of less-than-perfect gasoline, over speed protection, rpm reduction of the engine for low oil pressure and high engine temperature. Altitude compensation for air density. Self-diagnostic capabilities. Two fuel pumps for low and high pressure respectively.
Aquamatic sterndrive	The DuoProp drive with its twin counter-rotating propellers and exhaust outlet through propeller hub and cavitation plate produces a harmonious drive unit with unbeatable characteristics in the boat in terms of speed, acceleration, steering, maneuvering, fuel economy and less noise and vibration. The drive is equipped with cone clutch for easy and smooth shifting. Pattern-matched spiral bevel gears for optimum strength and minimum gear whine. Break-away shaft coupling to prevent costly drive train repairs. Sacrificial zincs located both on drive and transom shield. The drive is equipped with easily maneuvered hydraulic power trim for obtaining the best running position at different sea and load conditions. A choice of stainless steel propellers available for different applications. The 5.7 features standard power steering for maximum driving comfort. Full instrumentation including trim gauge and wiring harness.
Electrical system	12 VDC corrosion-protected marine electrical system which meets the U.S. Coast Guard requirements. The engine is completely wired with easy plug-in connection of wire harness to instrument panel. 65 AMP alternator. The electrical system for the engine is protected by a 50 AMP circuit breaker. Electric hydraulic power trim motor with easy plug-in connection, protected by a 50 AMP circuit breaker.

Technical description
Engine and block	— 2 bolt main cast iron cylinder block and cylinder heads — Cast pistons with two compression rings and one oil scraper ring — Five-bearing cast crankshaft — Valve train consisting of single camshaft, hydraulic valve lifters, push rods and two overhead valves per cylinder
Engine mounting	— Two adjustable rubber mounts, one on each side of the engine, and two between transom shield assemble and engine.
Lubrication system	— Pressure lubrication system with remote mounted full-flow spin-on oil filter
Fuel system	— Throttle body fuel injection — Fuel filter with water separator — Two electric fuel feed pumps — Stainless steel fuel lines
Inlet and exhaust system	— Marine intake manifold developed for throttle body injection (GSi) — K&N Flame arrestor — Closed crankcase ventilation — Seawater-cooled exhaust manifolds and risers made of cast iron — Complete exhaust line with pipe and bellows for exhaust outlet through the drive
Cooling system	— Thermostatically controlled freshwater cooling — Crankmounted seawater pump — Multi-V belt with spring tensioner — Electrocoated exhaust risers
Electrical system	— 12 VDC corrosion-protected electrical system — ECM unit ensures constant optimum performance with diagnostic capability — Outlet on alternator for voltage sensor cable for optimized charging — 65 AMP alternator with internal transistorized voltage regulator — Breakerless electronic ignition system — Two 50 AMP resettable fuses for protection of the engines’s electrical system and power trim — One 20 A resettable fuse for protection of the fuel feed pumps and one 12.5 resettable fuse for protection of the fuel injection system — Starter motor power 1.0 kW — Audio alarm for temperature and oil pressure
Instruments	— Complete instrument panel including: Rev counter, engine temperature gauge, oil pressure gauge, voltmeter, key switch, two fuses, instrument light switch — Wiring harness from engine to instrument panel — Digital trim gauge with active corrosion protection — Maneuver switch for power trim — Wiring harness from trim pump to maneuver switch for power trim and trim gauge
Drive	— DuoProp — Cone clutch — Coolant water intake for the engine located at the lower part of the drive — Pattern-matched spiral bevel gears — Exhaust outlet through propeller hub and cavitation plate — Overload protection sleeve (break-away coupling) — The drive can be tilted 55° — The drive can be turned 28° in each direction with power steering — Built-in kick-up function to reduce possible damage, in the event the drive strikes an underwater object — Belt-driven power steering pump — Oil cooler for power steering — Active corrosion protection as accessory
Power Trim	— Electrically operated hydraulic system with trim gauge for best driving comfort.
Accessories	An extensive range of accessories for: — Fuel system — Cooling system — Control system — Steering system — Instruments — Electric system — Comfort & Safety — Propeller & Drive — Maintenance

350 (5.7L) GSi/DP Technical Data

Engine designation		5.7GSi
Propeller shaft power hp		280 HP
Max engine RPM		5000
Displacement		5.7L/350 CID
Number of cylinders		V-8
Fuel injection		TBI 2 BBL
Bore/stroke		4.00" X 3.48"
Compression ratio		9.4:1
Volvo Penta DuoProp drive		DP-S
Ratio		1.95:1
Prop		F-7, dual stainless steel
Dry weight engine, transom shield and drive		1002 lbs
Engine length		36.95"
Engine width		28.2"
Height above crankshaft		21.9"
Depth below crankshaft		9.9"